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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90aaae821a32610cdb03b1795c285fe2e11530fea5a0ebba6eba10a36e12dae' 
  AND token = 't+YZ9K0HQouodZ45S01znp27xy0OhkVLQEu5Pyv93S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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