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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba92c178fec69c8082b73e7e355d294a29152365a63ff6fd4fd77ce3283b2a3a' 
  AND token = 'WNlwdPmScinM9bQ/h1fHVDgT/XL4EIoeEAl8SggXJKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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