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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783e4e49c5d4d3a17767c629defe412d81169fa370004c86a56c5edd15f10b70' 
  AND token = 'A8T12RmteAGTm+9Mx/Y6VT/oH+HXbskG941Gok8hNns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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