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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8ac637375a81f8c36ef56d643c426576d2b92345fcfc0b5e328f42a3fe654e' 
  AND token = '47kYQ6hX/Mik7JA7JYq76GI6nUNGqf2JblZZY5xrnLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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