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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2ce9eee0a6bf3a47b57e0bea9aaa66bc124a8076550179f02bf7fa88d201e3' 
  AND token = 'eVkIpZex2TBoXkAwgSEFHHljq0gvbwji+UayLKm+R8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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