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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cc54fdae225a799b7aafdc666c28252e2f674918e3e78069d08c59dd52baa9' 
  AND token = '7Ot7lH9srsHGjmhePc5J2bD44YZIdwGvJjJ3DjNiGDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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