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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03db01d0e77c00113148362c93eea7c81fc3dc5764568b4d303ed27d1d06adb' 
  AND token = '/gp5tA4RsVMBHIJW3Pk6PmAWMVqFtbH8IhU5n2TJA/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}