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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe0a346666a30fb8beda950f6c80b0e803bce1ea9aa9ac8ab9fbc4cd42b9fa6' 
  AND token = 'dz+8Kh9JkhkZxbfoY/O4+rSD5iXW14ARYqGvl0MIU7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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