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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd25ad55cacb97bafaf4c04e17b5c14f10efc7e2a18313588bb76db3952417ce' 
  AND token = 'K9PApmkIwaiaNoB0X2bGJjBeb+tCM4Rusk6HOHXklCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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