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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55c02a9fd9109e4c4bb4e3fd0d9433bd8d2101033f5c4307f999d4fb9142fa9' 
  AND token = 'p7TgVlCkxgeHF+eN1H3FSlPEsfhSjxyGjJSTLrjutc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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