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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de02ba5c165b9c4bd91522ffe0cdd756303b76e36f7aa42e0faea8de0c2425b' 
  AND token = 'YcsHiL53tl4sz5mek7ojA907MRcF0yp+omVTq1U+CIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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