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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f8eae75b3f434c077bbc36da64593337f92c848319a641552696f372559dab' 
  AND token = 'EsFLXyhSFexCj9d63Sh02Rxru6/HlpkX2tlT7KmJzd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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