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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecabfbc31f245f4e1364a65a606aa5f4a6b86a330d24ee67da861231e0f1fe7' 
  AND token = 'Yq87wUa1itnwqA8pIjndUfq5oyr4ifH3oP0P4gSkKcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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