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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7e563e56e5ae3c102d530303d4d914c2253041860f7d0fbb9a65c8970b03f7' 
  AND token = 'Ma/2VRlzwKOqodS0yaN/DZD9S4R6PsxEUhDW/o57sSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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