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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0cd3c8a85e968c4b810cb5ef7966015adf7285c3b947619d73c6be9906e3b3' 
  AND token = '4ZUrLswOxRwajZvhIyv5NyEMJORU9BUZKqxh5FW0ddE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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