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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce336ed886c82e68869c58d7d7540d7ce79be6ddf9a4acc4a2f5a77c9187c238' 
  AND token = 'OhnBKZs+bXRfyL3aJSARJFWMfk5kDL3QNPuZecEP/0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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