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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e727adbb6bec7d0a62cc54d30014e145f55fb8ffb2aded5893bf75bb7b655f' 
  AND token = 'XEIylkpjDH4f40RRvqOZXV76Sz5iMQA2c+u6JK+50AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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