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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f182e19fb5087cafc93b75cb3003e9543617f05427416ae63644e136b933a6f' 
  AND token = 'd22SvajAZS2pbbHeF80cfN6rZERM8M0Nr9skRLqsNRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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