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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7264ab6d3727f1e9b438c070f1155ef1e906aa7122e2b21cf80fad403bc8472' 
  AND token = 'lR44VH7joPrSgWtP6NjTU9JpIl23NvdlxR310/Gph6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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