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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60f5fbadf3f3eac56beeb7b632d06a5a2ebd0d83f605a42d3fbbb73d13b61e2' 
  AND token = 'yRjkhMZ+l3Q5LVMSa/3EGtZgEwp4VaF8utbVTahWzTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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