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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3633ad49c430c25f0e8f191a6755d1f01413141a7c4600e895fb1a9bf206230' 
  AND token = 'zlZH15J0ysmCZlxWIQ42WeGO6El5jE7hkWG0uEdAbyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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