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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e882160c5816c0b1f03d64a79e9882cf1f841e466c7a0c531749977fc82f4ca3' 
  AND token = 'rKnZUOdV2fV2ex1vWtdBYAtqg7En9YUIZH0uKqSf2Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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