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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3665630dd7801f542c3501ab911ed8764e2924d0209ceb884b9fdba293336b7f' 
  AND token = 'jvoAEYjd5kV1IxC34X1+1JBBd5n1yKd+MkyL8CFOT1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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