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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c92bce9ad1861f0bc4d0cd7f6160af5200095cd2e9b8adaf64c902488eb61d' 
  AND token = 'fJp1mp6kqnDx7hVJzrJA8oaiWjMG+inU4Dwom8AAf2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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