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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18e620cb9bb77f78f0e6efbd14b0db13db74262e37a54ff4286736f6832b902' 
  AND token = 'eh1ykir9WnOIvF61kVrkiwPdIpxjqY2J/i1Kd4faRW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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