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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd9665b54cd6078056f43db718eb59618dd810a7ab2f78f2e7b997a3baeda47' 
  AND token = 'gaOGYS9W217u0Atbu7Qn2gXlP08wONuhNB+abbSM9Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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