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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537de92543ffafc54c21fe5600edb943140606eaae4d565a199f9894a7d12a77' 
  AND token = 'jfdkyIU1jm0UsOu6ZCGiPX4Y8E3Bj+ZP306VxXvG2z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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