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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e557d20ae7b671a1840a0807456960e59d35e15adaa6f197aa0a0186fbdaa435' 
  AND token = 'G8lU8zrnN/2956+clWBkYU6gDHZ/y0kuUr4XoDJ1gik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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