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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b1a86bbef1bcdf0dbc3a5f489b2b994d4f950a3560ea04b0ada331f0a126ad' 
  AND token = '97ElLNIABHRVNYoyjrq9gM/uxSAdQ4BxZllBIPv04W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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