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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ff16e0e2146c5898774d265dc95d9df344c2989d6691ca157d0dd30725411c' 
  AND token = 'c0Ed7JyUwhb02Syy1vif0JULWAZuxQaHUZ3QhflLi/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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