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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe3c09670e9cf77eb4087842b947f1b2f834fd078ce2eb33482b8af0c1a4448' 
  AND token = 'U3sG0kVJlWP+CG9N62ng0RDClwSV3lS5fGalilt152A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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