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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d56ff39482d9265a96d746e3cae8c574bf7e91b42dcd1a824b44f2c1c5051c' 
  AND token = '/6jSwq9VD3HSh6+iNWNp4UqRfeVbayr39JnyR9Nafok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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