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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132c6f49fb55ca641fba74934cd5df637b5184257fb9b8b4d3446927c28cbf49' 
  AND token = '3RzFKq8548G3c21yvceZ7uf84JK+R7YAibnb6yIchQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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