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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b704e1a5ffebc420ebcb76e77a63653d7af115e6096ad63423cc3d2d905f823c' 
  AND token = 'ea3wcW5HgZ3TP3MME6iguOfpkrLCDIXuPmCXaILVai0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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