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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c330978c5fb8ffc55ac5c71264f6945abff595fc6a0a1df5497807c1b100e7a1' 
  AND token = 'si48MLBVVNw9BDTv38sWzDIRDopsff+72FUFSu3u40M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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