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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e057cc049876e29a5df2756f340e60cedd138334abb322c41836d8de9b5c5f00' 
  AND token = 'HG3SWWZcIstxmL8uBlsYFl4a5Be4R8U/bqR6yTlhnzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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