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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5e778e4cbc2711976c7f3dc3698f24742cd2ce440c66de8760fef38e9e1eb7' 
  AND token = 'mRQY5LcjmbKWlHmJ0JbQihE7gwOkBJltSD7X3rGfhjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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