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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc263fcef6d90134da52a7be2a645c17835b35b70732bac75b0ab39e30a8998' 
  AND token = 'Sa4J2oBfyefLrMgsR+ok1CnGtv8XD0+rxDBJzHHAijQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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