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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e503ba4096cd94ea2a3971988ead0bce56079b41b06f391f7a6df386b6ef5fd4' 
  AND token = 'WtzE0+ANh1NhcLlugYhjZaJuyii+EFIjW1efFIjHIck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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