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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5793bfec5f601248d0f55a2669e4f64736c7ad4f9d6b1721f6279dca1a9dc124' 
  AND token = 'T91ugoH5xkCG5Ir8LGttdrh/ynVsg90Ewgb9K7s94U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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