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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e066e2ca756b54b2af0bf9c745a731ca9027a3ab3b14abfbda71615cbc448b8d' 
  AND token = '6O0Bqd9LHquKaUyFtddL5R+MvqxoXB+SE9jxaWTtLeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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