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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a8d9be483e08a3c4c041c29ef2a40fdf82de9038d88947976794bec68587db' 
  AND token = 'ruJtHGUxgERVC+h9EQrlXLBaEL7knoQx8vrbWFrOa80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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