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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4b8c52587d0db1e553d0fe69da690e6c30308d53a4e4040463a10d6b9fe3df' 
  AND token = 'nPLNzVwiTkMade14hw4dvJaX0BJRIzwOWk+C9aTmd5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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