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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd6ad8ecc111d718d2e12d740e8ff74560598c9ea634e15450ed49b5871bb0b' 
  AND token = 'lq0yijkiS1Ui2EvMjpCG8bO0qWjz8CGAqy0yd93Zsqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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