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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb477abb0df7011141ebb1f08858ae7cfccd2722884f0b69155a2a24ff2af2b7' 
  AND token = 'y29EgLu/QArD9lnZCifaTiqh1oIIfO7TG+IjuPcx0yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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