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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242e1e8e2c32e74d0c98b6ace9dd3cb5e23e21327925f867756071af5aa2b060' 
  AND token = 'ipXTF/SdQjOkK9Il0GDYyTkHZyrL2AInmPNVUPpwe5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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