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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441d0e9eeb5534407b44152269aaa6f3fbd860b0b1fa93c95172ec27393b7a02' 
  AND token = 'HwyXk1802pPyZo3S4NAX7Am6h039oQc7LTwzx8H+6T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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