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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c184d3416d92d1f798bfe2650fb1652a8900435ef0f82ffd8dc30bf0dc86b8e7' 
  AND token = 'SypyrFe1WllBRQztZK1fEP2WN/2BAekEbA4Qo4ssas8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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