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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190a9d1460996966fdd1e2a4a6c12a55ac7592994d69240d7631823629685c3d' 
  AND token = 'S/vtjaJ7mAgmCiZo4FWSTCJXAELoqEzUE8UyVCGc93s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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