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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e645c907d9f70afe00c65489b7e770cb6c7204682cb13aedd3cdc4844ddcf6' 
  AND token = 'Sab++tLEKsGjZyso7qKZJZZpyrY66NeInsbnoy/P13g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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