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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d88ea6de51411dd00a240e1df72faa9873296df4db66c835a68c305f73ef9d' 
  AND token = '2dwaRNefymU7BtXR4NeZ4mG9MzYWEX0J599kINVjI7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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