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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acfc17adadca2fc58e91468c94c01b944c69838e04d8832db796026bcab48e6' 
  AND token = 'IeMTIoyaxTQAioczhpQgTOakArObVHUdV+5NaGE2GGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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