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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1704a88251e02c782df07c82f596308084e790ee7559ef5206abb9b94cc6910' 
  AND token = 'YVQ64xYBZRB7tNxNr4bVghYt7aPytaH4HE79jSJjlHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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