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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d93db47eaf82225297784689453a1364a54830cb189faa7bc89427d657b700' 
  AND token = 'M0gYN7eohMbBClLVoOX9dw8Lpx1WE4ZzZrrflaez6QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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