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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad83666e17b87e920933541b0b8848c1503a7e988520fff2a68bc8e2a338d43e' 
  AND token = 'mp4nVIPXrcrhpzazqkSm3EFj4AfcbPUSwX7+3lDTh1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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