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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad0396176a2b1a241501d14f935f8e211c79f94597ee0275f3eb7e5c137d1bb' 
  AND token = 'DbSiWwNRE5fN9RB6aMRG0Uyxjyu7j3PTvpijtQXnV2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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