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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eef86ec019c171427567388538348c1c662716d6a1d163b9d59d0d7e8a52c0d' 
  AND token = 'psi990KpldoQ9/FxZhOx2RUauGTtuvS0s3LQ7vm4by4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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