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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d09bab652f11130806715bca0c5098dae0f50100e6e6d992a64f4958517db07' 
  AND token = 'Y6nyeaC7UZwg4UhLpDlbVkvKdCik1foL1h5Kdnt67aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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