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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9e9952a3ebaba6f59bdd9b083a487ddc2fd120831e3530a1c3bdca086f6929' 
  AND token = 'GYkX3XWKDQsjaAJWf8IbMpySgwonrtSqbcFx4pEa4o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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